Wireless communication method and system for differentially controlling power according to distance

Abstract

A wireless communication method for differentially controlling power according to a distance, includes: generating a packet for measuring a distance between the access point and the client; transmitting the packet to measure the distance; receiving a response of the client for the packet transmitted; and transmitting data to the client in the quantity of power that the client can receive according to the received response of the client.

1 . A wireless communication method for controlling transmission power, the method comprising: 
 transmitting a plurality of packets at different transmission powers;    receiving a response to one of the packets from a device; and    transmitting data to the device at a transmission power that the device can receive according to the response.    
   
   
       2 . The method according to  claim 1 , wherein the transmitting the plurality of packets comprises sequentially transmitting the packets at increasing preset power levels.  
   
   
       3 . The method according to  claim 1 , wherein the response indicates a packet, among the plurality of packets, which is received first by the device, and the transmitting the data to the device comprises determining the transmission power that the device can receive as a transmission power of the packet which is received first by the device.  
   
   
       4 . The method according to  claim 1 , further comprising instructing the device to set a transmission bandwidth which is determined according to the transmission power that the device can receive.  
   
   
       5 . The method according to  claim 1 , wherein further comprising determining a transmission bandwidth corresponding to the transmission power that the device can receive.  
   
   
       6 . The method according to  claim 1 , wherein the transmitting the plurality of packets comprises determining the different transmission powers based on bands of a transmission bandwidth.  
   
   
       7 . The method according to  claim 1 , further comprising controlling a transmission bandwidth of the device through a media access control layer of the device.  
   
   
       8 . The method according to  claim 1 , wherein the receiving the response to the packets comprises receiving a plurality of responses from a plurality of devices, and 
 the transmitting the data comprises transmitting the data to the devices at the power level that the all of devices can receive according to the responses.    
   
   
       9 . The method according to  claim 8 , wherein the transmitting the plurality of packets comprises sequentially transmitting the packets at increasing preset power levels, 
 wherein the response from each of the devices indicates a packet, among the plurality of packets, which is received first by the corresponding device, and    wherein the transmitting the data to the devices comprises determining the transmission power that all of devices can receive as a highest transmission power of a packet, among the plurality of packets, which is received first by one of the devices.    
   
   
       10 . A wireless communication system for controlling transmission power, the system comprising: 
 an access point which transmits a plurality of packets at different transmission powers; and    a device which receives at least one of the packets and transmits a response to the access point,    wherein the access point transmits data to the client at a transmission power that the device can receive according to the response.    
   
   
       11 . The system according to  claim 10 , wherein the access point sequentially transmits the plurality of packets at increasing preset power levels.  
   
   
       12 . The system according to  claim 10 , wherein the response indicates a packet among the plurality of packets which is received first by the device, and the access point determines the transmission power that the device can receive as a transmission power of the packet which is received first by the device.  
   
   
       13 . The system according to  claim 10 , wherein the access point instructs the device to set a transmission bandwidth which is determined according to the transmission power that the device can receive.  
   
   
       14 . The system according to  claim 10 , wherein further comprising determining a transmission bandwidth corresponding to the transmission power that the device can receive.  
   
   
       15 . The system according to  claim 10 , wherein the access point determines the different transmission powers based on a transmission bandwidth.  
   
   
       16 . The system according to  claim 10 , wherein the access point controls a transmission bandwidth of the device through a media access control layer of the device.  
   
   
       17 . The system according to  claim 10 , further comprising a plurality of devices, wherein each of the devices transmits a response to the packets, and the access point the data transmits the data to the devices at the power level that the all of devices can receive according to the response from each device.  
   
   
       18 . The system according to  claim 17 , wherein the access point sequentially transmits the packets at increasing preset power levels, 
 wherein the response from each of the devices indicates a packet, among the plurality of packets, which is received first by the corresponding device, and    wherein the access point determines the transmission power that all of devices can receive as a highest transmission power of a packet, among the plurality of packets, which is received first by one of the devices.    
   
   
       19 . A wireless communication method for controlling power, the method comprising: 
 transmitting a plurality of packets at different power levels from an access point to a device;    receiving a response from the device, wherein the response indicates a packet, among the plurality packets, which is received first by the device; and    determining a distance between the access point and the device according to the response.    
   
   
       20 . The method according to  claim 19 , wherein the determining the distance comprises calculating the distance based on a transmission power of the packet which is received first by the device.  
   
   
       21 . The method according to  claim 20 , further comprising determining the transmission powers by dividing a maximum power defined in a radio transmission standard by a number of bands of a transmission bandwidth.  
   
   
       22 . The method according to  claim 21 , wherein the transmission powers are increased in approximately 5 mW intervals.